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There are four copolymer structures as shown and defined in Table 1 below. Table 1. (r e f e r 8, 1 0, 1 1) Types of copolymers with characterization. Styrene butadiene rubber is an example of a block copolymer. It is composed of unit a- H 2 C=CHC 6 H 5, styrene, and unit b-H 2 C=CH-CH=CH 2, butadiene. As defined, this type of copolymer is ... 23. Define anion and cation. In the preceding example, which is the anion? Anion is a negatively charged ion. Cation is a positively charged ion. In the preceding example, chloride ions are the anion, and sodium ions are the cation. 24. What is a hydrogen bond? Indicate where the hydrogen bond occurs in this figure.